feat: complete Epic 0 — foundation migration & infrastructure setup

Stories 0.2-0.5: rename folders→declarations (backend+frontend), configure
Redis for cache/queue/sessions, add foundation database migrations
(permissions, archived_at), replace DeclarationStatus enum with architecture
lifecycle values, create DeclarationObserver for status transition validation
and auto-archive, fix controller status transitions to respect observer rules.

93 tests pass (240 assertions).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Models/Workspace.php

@@ -14,7 +14,7 @@ use Spatie\Activitylog\Traits\LogsActivity;
 class Workspace extends Model
 {
     /** @use HasFactory<\Database\Factories\WorkspaceFactory> */
-    use HasFactory, SoftDeletes, LogsActivity;
+    use HasFactory, LogsActivity, SoftDeletes;
 
     /**
      * The attributes that are mass assignable.
@@ -57,13 +57,13 @@ class Workspace extends Model
     }
 
     /**
-     * Get the folders for the workspace.
+     * Get the declarations for the workspace.
      *
-     * @return HasMany<Folder>
+     * @return HasMany<Declaration>
      */
-    public function folders(): HasMany
+    public function declarations(): HasMany
     {
-        return $this->hasMany(Folder::class);
+        return $this->hasMany(Declaration::class);
     }
 
     /**